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    <title>Document</title>
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    <script>
        //1. Object.is 判断两个值是否完全相等
        console.log(Object.is(120, 120));//true
        console.log(Object.is(NaN, NaN));//true
        console.log(NaN === NaN);//false
        //2. Object.assign 对象的合并
        const config1 = {
            host: 'localhost',
            port: 3306,
            name: 'root',
            pass: 'root',
            test: 'test'
        }
        const config2 = {
            host: 'http://baidu.com',
            port: 33060,
            name: 'baidu',
            pass: 'baidu'
        }
       
        console.log( Object.assign(config1, config2));//config2会覆盖config1

        //3. Object.setPrototypeOf  Object.getPrototypeof
        const school = {
            name: '张三'
        }
        const cities = {
            xiaoqu: ['北京','上海','深圳']
        }
        Object.setPrototypeOf(school, cities)
        console.log(Object.getPrototypeOf(school));
        console.log(school);

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